Question

Answer all 3 questions
it's urgent ​

Answer 1

Answer:

1.As it has a layer of magnesium oxide due to contact of air, that prevents burning

2.As it contains free ions h+

3.it is done to check water of crystallisation

If heated then blue copper crystals becomes white

Water of Crystallisation in copper is Cu.5H2O.

full answer of all three

Answer 2

Answer:

1. Magnesium is a very reactive metal. When it is kept in open it can react with gases present in air. So, to prevent further oxidation it is cleaned.